# US 11,110,686 B2 · Hot-working material, component and use

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- Number: US 11,110,686 B2
- Document ID: US11110686B2
- Status: Granted
- Kind: B2
- Application number: 16/612,817
- Filed: 2017-05-16
- Published: 2020-11-05
- Granted: 2021-09-07
- Earliest claimed: 2017-05-16
- Assignees: thyssenkrupp AG
- Applicants: ThyssenKrupp Steel Europe AG; thyssenkrupp AG
- Inventors: Jens-Ulrik Becker; Stefan Myslowicki
- Web page: https://patentgrep.com/patent/US11110686B2

## CPC

- B32B 15/011: {all layers being formed of iron alloys or steels}
- B21D 22/02: Stamping using rigid devices or tools
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/22: with molybdenum or tungsten
- C22C 38/26: with niobium or tantalum
- C22C 38/28: with titanium or zirconium
- C22C 38/32: with boron
- C22C 38/38: with more than 1.5% by weight of manganese
- B32B 2250/03: 3 layers
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

The invention relates to a hot-forming material composed of a three-layer composite material, comprising a core layer of a hardenable steel which in the press-hardened state of the hot-forming material has a tensile strength >1900 MPa and/or a hardness >575 HV10. Two outer layers are bonded substance-to-substance with the core layer and composed of a steel which is softer in comparison with the core layer and which in the press-hardened state of the hot-forming material have a tensile strength >750 MPa and/or a hardness >235 HV10. The invention further relates to a component and also to a corresponding use.

## Claims

### Claim 1

A hot-forming material composed of a three-layer composite material, comprising a core layer of a hardenable steel which in a press-hardened state of the hot-forming material has at least one of a tensile strength >1900 MPa and a hardness >575 HV10, and two outer layers bonded substance-to-substance with the core layer and composed of a steel which is softer in comparison with the core layer and which in the press-hardened state of the hot-forming material have at least one of a tensile strength >750 MPa and a hardness >235 HV10, wherein the core layer, besides Fe and unavoidable production-related impurities, in wt %, consists of:
C: 0.31-0.6%, Si: up to 0.5%, Mn: 0.5-2.0%, P: up to 0.06%, S: up to 0.03%, Al: up to 0.2%, Cr+Mo: up to 1.2%, Cu: up to 0.2%, N: up to 0.01%, Nb+Ti: up to 0.2%, Ni: up to 0.4%, V: up to 0.2%, B: up to 0.01%, As: up to 0.02%, Ca: up to 0.01%, Co: up to 0.02%, Sn: up to 0.05%; and
wherein the outer layers, besides Fe and unavoidable production-related impurities, in wt %, consist of:
C: 0.13-0.3%, Si: up to 1.0%, Mn: 0.3-3.0%, P: up to 0.1%, S: up to 0.06%, Al: up to 1.0%, Cr+Mo: up to 1.5%, Cu: up to 0.3%, N: up to 0.01%, Ni: up to 0.3%, Nb+Ti: up to 0.25%, V: up to 0.05%, B: up to 0.01%, Sn: up to 0.05%, Ca: up to 0.01%, Co: up to 0.02%.

### Claim 2 (depends on 1)

The hot-forming material as claimed in claim 1 wherein the core layer has a C content between 0.33-0.55 wt %.

### Claim 3 (depends on 1)

The hot-forming material of claim 1 wherein the outer layers each have a thickness of material of between 5% and 30%, based on the total thickness of the hot-forming material.

### Claim 4 (depends on 1)

The hot-forming material of claim 1 wherein the composite material has been produced by means of cladding or by means of casting.

### Claim 5 (depends on 1)

The hot-forming material of claim 1 wherein the ratio of the C content of the core layer to the C content of the outer layer is <6.

### Claim 6 (depends on 1)

The hot-forming material of claim 1 wherein the hot-forming material in the press-hardened state possesses a factor S>1 000 000 [MPa2].

### Claim 7 (depends on 6)

The hot-forming material of claim 6 wherein the hot-forming material in the press-hardened state possesses a factor M>110 000 [° MPa].

### Claim 8 (depends on 6)

The hot-forming material of claim 6 wherein the hot-forming material has been provided on one or both sides with an anticorrosion coating, including one of a zinc-based coating and an aluminum-based coating.

### Claim 9 (depends on 8)

The hot-forming material of claim 8 wherein the hot-forming material is part of a tailored product, including one of a tailored welded blank and a tailored rolled blank.

### Claim 10 (depends on 1)

A component produced from a hot-forming material as claimed in claim 1 by means of press hardening.

### Claim 11 (depends on 10)

The use of the component as claimed in claim 10 in bodywork or in the chassis of a land vehicle.

### Claim 12 (depends on 1)

The hot-forming material of claim 1 wherein the core layer of the hardenable steel in the press-hardened state has at least one of a tensile strength >2300 MPa and a hardness >685 HV10.

### Claim 13

A hot-forming material composed of a three-layer composite material, comprising a core layer of a hardenable steel which in a press-hardened state of the hot-forming material have at least one of a tensile strength >1900 MPa and/or a hardness >575 HV10, and two outer layers bonded substance-to-substance with the core layer and composed of a steel which is softer in comparison with the core layer and which in the press-hardened state of the hot-forming material have at least one of a tensile strength >1200 MPa and a hardness >370 HV10.

### Claim 14 (depends on 2)

The hot-forming material of claim 2 wherein the core layer has a C content between 0.37-0.53 wt %.

### Claim 15 (depends on 1)

The hot-forming material of claim 1 wherein the outer layers have a C content between 0.17-0.25 wt %.

### Claim 16 (depends on 3)

The hot-forming material of claim 3 wherein the outer layers have a thickness of material between 10% and 20%, based on the total thickness of the hot-forming material.

### Claim 17

A hot-forming material composed of a three-layer composite material, comprising a core layer of a hardenable steel which in a press-hardened state of the hot-forming material has at least one of a tensile strength >1900 MPa and a hardness >575 HV10, and two outer layers bonded substance-to-substance with the core layer and composed of a steel which is softer in comparison with the core layer and which in the press-hardened state of the hot-forming material have at least one of a tensile strength >750 MPa and a hardness >235 HV10;
wherein the core layer, besides Fe and unavoidable production-related impurities, in wt %, consists of:
C: 0.31-0.6%, Si: up to 0.5%, Mn: 0.5-2.0%, P: up to 0.06%, S: up to 0.03%, Al: up to 0.2%, Cr+Mo: up to 1.2%, Cu: up to 0.2%, N: up to 0.01%, Nb+Ti: up to 0.2%, Ni: up to 0.4%, V: up to 0.2%, B: up to 0.01%, As: up to 0.02%, Ca: up to 0.01%, Co: up to 0.02%, Sn: up to 0.05%;
wherein the outer layers, besides Fe and unavoidable production-related impurities, in wt %, consist of:
C: 0.08-0.3%, Si: up to 1.0%, Mn: 0.3-3.0%, P: up to 0.1%, S: up to 0.06%, Al: up to 1.0%, Cr+Mo: up to 1.5%, Cu: up to 0.3%, N: up to 0.01%, Ni: up to 0.3%, Nb+Ti: up to 0.25%, V: up to 0.05%, B: up to 0.01%, Sn: up to 0.05%, Ca: up to 0.01%, Co: up to 0.02%; and
wherein the ratio of C content of the core layer to the C content of the outer layer is <3.

### Claim 18 (depends on 1)

The hot-forming material as claimed in claim 1 wherein the outer layers, besides Fe and unavoidable production-related impurities, in wt %, have a C content that consists of: C: 0.13-0.28%.